Is your callback definitely being hit by Facebook? check your server logs and make sure you're receiving the request and responding to it correctly - note that if your callback is HTTPS your certificate needs to be fully valid including all intermediate certificates
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IgyMar 23 '12 at 19:51

1 Answer
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Check your server logs and make sure you're receiving the request and responding to it correctly - note that if your callback is HTTPS your certificate needs to be fully valid including all intermediate certificates